Refrigerating means for cinematographic apparatus



Sept. 2, 1924.

C. ANSELMI ET AL REEBIGBRATING MEANS FOR CINEMATOGRAPHIC APPARATUS Filed May 7. 1921 aMJWl WOEQ Kevin, M

Patented Sept. 2, 1924.

UNITED STATES PATENT OFFICE.

CARLOS ANSELMI AND MARCELINO VITURRO', or BUENOS AIRES, aaruntro or ARGENTINA.

mamas-mamas MEANs non oINEMAToGRAPHIc APPARATUS.

Application filed May 7, 1921. sesame. 467,537.

To all whom it may abatem- Be it known that we, CARLOS ANSELMI and MAizoELINo Viriiimo, subjects of the King of Italy and of the King of Spain, re spectively, residing at 3175 Federico Lacroze Street, Buenos Aires, Republic of Arentina, have invented certain new and useul Improvements in Refrigerating Means for Cinematographic Apparatus, of which the following is a specification.

This invention relates to certain improvements in cinematographic apparatus, its main object being the provision of means devised to avoid the heating of the film when passing in front of the projecting Window.

It is awell known fact that in cinematographic apparata. heretofore used the film is considerably heated when passing in front of the projectin window on'account of the heat irradiate by the projecting lamp. In consequence, when the movement of the film is interrupted, due to any cause, said film has a tendency to be heated and burnt, with the attached losses and danger.

It has been already proposed to mitigate such heating effects by the action of the obturating fan, but even considering that said refrigerating action is not sufficient, there is always the drawback that when the movement of such fan is stopped, by any circumstance, the movement of the fan being in synchronism with that of the film, the refrigerating effect of the same is eliminated and the film is also heated.

According to our present invention, in order to obtain a constant cooling of the film a combination of two different devices is used, one of which avoids the effects of the heat and light of the lamp to extend beyond the actual surface of the picture which at the given moment is projected through the window and the other providing an artificial cooling totally independent of the general working of the apparatus.

In order that our present invention be clearly understood and easily carried into practice a preferred embodiment of the same has been illustrated in the accompanying drawings, wherein,

ig. 1, is a view of the projecting window of cinematographic apparatus, according to our improved construction, from the side wherefrom the light ray are received and,

Fig. 2, is a vertical central section of the same.

In the said figures like characters of ref erence denote same or like parts.

According to the embodiment shown, 1 is the ordinary chassis of the apparatus where in the window 2 is supported by means of the rods 3 provided with springs 5 tor elastical support of said window.

According to our present invention at the inner side of frame 1 a plate 5 is conveniently fiXed in front of the said window by means of long screws 6 so as to be kept a suitable distance apart from said window. The said plate is formed with a central opening corresponding in shape and size to the picture actually in front to the said window 2, as it will be easily seen from Figure 2. Said plate 5, which may be of any suitable material, has for its object to intercept the light and heat rays from the projecting lamp. so as toavoid their incidence beyond the surface of the picture actually projected through window 2. In this manner, the only heated part of the film is that which corresponds to the actually projected picture.

Around the window 2 and on all or two of its sides as shown in the embodiment of the invention, a tube 7 is placed, said tube being provided with a number of small holes 8 bored so that they may throw small jets of air on the film in front of the window. Said tubes 7 are connected to a main tube 9 which may be connected at 10 by any suit able means to a source of air under pressure.

When the apparatus is under working, the air of the source of air under pressure, not shown-passes through the tube 9 and tubes 7, and is distributed through the openingsS of the said tubes impinging on all the surface of the film in front of the projecting window. This portion of the film is the only portion which receives the heat from the lamp and in consequence of it being thoroughly cooled, there is no danger in stopping the motion of the film at any moment.

With the improvements of our present invention a determined picture may be exposed for a considerable time, without any danger, stopping the movement of the apparatus. This may be of special advantage for the projection of reading matter, this causing a great economy in the length of the film compared with the present processes.

lif

Furthermore there is not the slightest danger of accident due to an unexpected stopping of the film. The film may be also stopped at any interesting picture, or films may be emploved for the projection of fixed pictures.

It is obvious that our present invention is not limited'to the precise embodiment described with reference to the accompanying drawings and that some changes may be introduced without departing from its scope which has been clearly set forth in the appended claiming clauses.

What we claim as our invention and desire to protect by Letters Patent is: I

1. In an apparatus of the type described, a plurality of tubes positioned around the projecting window, said tubes having a row of small perforations so arrangedthat the compressed air from within the tube impinges in the form of a plurality of .small jets directly onto that portion of the film which is in front of the window, and means for elastically supporting the window.

2. In an apparatus of the type described, a plate with an opening therein, said opening being of such shape that the plate forms a mask which prevents the rays from the source of illumination from impinging on any part of the film except that directly in front of the projectin window, and a plurality of tubes arranged around'said projecting window, said tubes having a row of small perforations therein, and arranged so that compressed air from within the tubes may impinge in a plurality of directions directlyonto that portion of the film which is directly in front of the window.

3. In an apparatus of the type described, a plate with an opening therein, said opening being of such shape that the plate forms a mask which prevents the rays-fromcthe source of illumination from impinging on any part of the film except that directly in front of the projecting window, and a plurality of tubes arranged around said projecting window, said tubes havingia row of small perforations therein, and arranged so that compressed air from within the tubes may impinge in a plurality of directions directly onto that portion of the film which is directly in front ofythe window, and means for elastically supporting the film Window.

In testimony whereof we ha v e hereunto &

set our hands. vCARLOS ANSELMI.

MARGELINO. VITURRO. Witness: V RonoLro RAMfRnz'. 

